About Optics & Photonics TopicsOSA Publishing developed the Optics and Photonics Topics to help organize its diverse content more accurately by topic area. This topic browser contains over 2400 terms and is organized in a three-level hierarchy. Read more.

Topics can be refined further in the search results. The Topic facet will reveal the high-level topics associated with the articles returned in the search results.

Abstract

Confinement loss is comprehensively evaluated for TE, TM, and hybrid modes of Bragg fibers using a multilayer division method newly developed. We show the loss dependence on the core radius, wavelength, cladding index contrast, and the number of cladding pairs. The confinement loss is reduced in proportion to (a/b)2N and (n2bb/n2aa)2N for the TE and other three modes, respectively, with respect to cladding pairs N under the quarter-wave stack condition, with cladding high na and low indices nb and their corresponding thicknesses a and b. For sufficiently large core radius, the confinement loss decreases in inverse proportion to the third and first powers of core radius for the TE and other three modes, respectively. Low loss modes are the TE01, TE02, HE13, and TE03 modes in order of increasing confinement loss.

(Color online) Core radius dependence of confinement loss for TE and TM modes as a function of cladding high index. λ0=1.0 µm, nb=nex=1.5, and N=10. Cladding thicknesses, a and b, are determined from Eq. (16) for each combination of rc, na, and nb.

(Color online) Wavelength dependence of confinement loss for TE and TM modes as a function of cladding high index. λQWS=1.0 µm, rc=2.0 µm, nb=nex=1.5, and N=10. All the modes are shown that exist at λ0=1.0 µm for each na.

(Color online) Cladding pairs dependence of confinement loss for the TE01 mode as a function of core radius and cladding high index. λ0=1.0 µm, and nb=nex=1.5. Cladding thicknesses, a and b, are determined from Eq. (16) for each combination of rc and na. Dotted, solid, and dotted-dashed curves indicate na=2.5, 3.5, and 4.5, respectively.

(Color online) Wavelength dependence of confinement loss of the TE01 mode. λQWS=1.0 µm, nb=nex=1.5, and N=10. Cladding thicknesses, a and b, are determined from Eq. (16) at λ0=1.0 µm for each combination of rc, na, and nb.